Automatic entries can cause data loss

[bergie]

Very rare occurrence, but I've seen this now happen twice (in some 7k miles logged with logbook) where an automatic entry made into a day can somehow lose all previous entries from the day.

Here's an example of this happening (via a sail change log entry): meri-imperiumi/log@af17576

[bergie]

It is almost certainly caused in https://github.com/meri-imperiumi/signalk-logbook/blob/main/plugin/Log.js#L125

return this.getDate(date).catch(() => []);

As to why we get an error when reading the stored entry, no idea.

[bergie]

7b9fa7b might be the fix. Sometimes navigation.position seems to contain invalid additonal keys.